Are DISABLE_UTMP and DISABLE_WTMP defined in config.h? What did output
after "checking for obsolete utmp and wtmp in solaris2.x" ?
> An other thing...
> we have since Sunday (the day of the paket switch) some defunct´s in the
> process list
> 24342: lwp_cond_wait(0xFEC834E8, 0xFEC834F8, 0xFEC7CD80) (sleeping...)

LWP == lightweight process == thread? Did you build it with POSIX
threads? If so, that's unsupported. Does it occur building without?